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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cea328d75ba1cc7e8905159e7748a81658ac0523ec767c8f4bdea0b8b923e993' 
  AND token = '1tZvnWqARXb5hfFDMnxnY/eRmrb6R1UBdKqyQ/9j4qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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