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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9683816e607f3871c62398104891c2dd61252e4bd42fdb7aae800867dc3f52' 
  AND token = '+Cf0mx8M0XOlRepz1O9nHpJNRh2334Tbxa9O/hBRmts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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