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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c4ace1e43875e53887cef8bd28d76af792f8af68ad5e5fe033236f4573889b3' 
  AND token = 'tyFqOSwee92Exv5CXBn1T7LtaC6UvgMx4lVSP4L4PNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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