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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27f9bfa268b13e1d6eaa2746e6fa4fd46191ee150e1c2e80baa613b046ee701f' 
  AND token = '4H9ZFHSzhbf7Fhdii+EKdqICC1G6UwWc5c+9YbE745c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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