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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72988410e7be1d71bbe633bbde0c2b2c15e053f7fcaf8b5a611ce8e29e27cd26' 
  AND token = 'Qq4pFtP9g8QcCXgXDAt2qZAUFknysKJqX7Y3Q11GvEA=' 
  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"
    }
  }
}