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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289f94e55c5fe5f540ae4b0b2a7380c65226e1c87830e8305f0990b37860fcf5' 
  AND token = 'm6gdMlpE1Q9e+iHC5Qgz45hrxGvAT1WJH773fseB7eM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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