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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae6886c0a3e32246302ec8f91d4f3e6da6c902b21e053718992f1ba96ea713b' 
  AND token = 'o5d1aGmU8SBAJopGu/cA+QlgSzwQD7bSEORTyPvfuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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