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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eec825a514cb0cbd44bbc9768b8b3c8029ebade5d94a2da887f13f2d9841d2e' 
  AND token = '9hava+xTYSTCNrzrKF8Od2+r5+WUgYq6RFTEyyJl0M8=' 
  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"
    }
  }
}