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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e72fa7d58907f501ad14d010c7f6648a7e06a0f7c2cf601c6b446922a947fc' 
  AND token = 'D6FIpZ79Vb8vf6yvnviU+Tu2JWe5YPLivSZLocbcW+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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