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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01de92a8e839e0183bec53dcb16ffdb7d90b7514e6ba5597595686174f1ed195' 
  AND token = '91+Ea2Thz1ZyGjbIwIXBJCtfkkRbp5vPMDPeivMRgm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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