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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a95c4a806731e5291d2e6c5a0b81dc959f1e94c21a8b42725bcb092ef2edf5b' 
  AND token = 'M1WX3HPpdxG8gtgK5dOAEUp0Hzsfh8HcT1bkONebI0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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