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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a96811187f14d00e5e3becd5a962b44ff7c12711873e7f06f366205bb8a3ceee' 
  AND token = 'iCUKJ1mj9RPRO2lFofwvGK6q8smyRdIXrop0yVey8lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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