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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7525d44b09b5aa0b7682189a6cc7313678ff53f39b2d431ad582797670d5e6b' 
  AND token = 'DW7phsBcyY7A8AkdUEqf/A6Lpcoa1mdzAMZn+NDsWDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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