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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136ab7e61d51691485a16d6497d12f57d14ace237f0b01e2a165b7a299d749d1' 
  AND token = '0YPhfj1RC+3KUXJjH30F0BNL5qHHJFMTQQoSrHPjw5M=' 
  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"
    }
  }
}