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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00fc66bd4b547c298455e4ba4d07012def616d18687a45238706b308f60c0bbc' 
  AND token = '6bBheR2eR1+BIby3JNSwWdw5NNPPQ+1EetkrbJTamO0=' 
  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"
    }
  }
}