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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f98ddc9d2868fca25947d228567c7e353638ec89d76ea39db0db2aa28395ed85' 
  AND token = 'NLqiqa1TMTq9jpe+EODM8tP3Lc4BJVZc7cUvCu6V3TM=' 
  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"
    }
  }
}