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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a119f5a1cdbe0e2115cbc37bce15c991bb060fba95cf1a9f9196188cc3664e7' 
  AND token = 'fLZ8rI66Cs0pxYLoVEDwjzLhIlwa9JAbDie7mUugqlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}