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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffceedbb71878947e48434f3470a624e8c7251ad5df5350440c7f54d98883f69' 
  AND token = '4MCAyaXh2CK1M7ELLNJ4te4vXSwxFNyNy6+8MGCu/TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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