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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e026d63c15e385760dd761aeb214152ea2bb4768e6b54c84c340b193a697526' 
  AND token = '9mjMQ7h8ayqyDNKJ2r9qX4/fpFv1Ciu/6NbqQILMLYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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