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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bc4c5e45e95652be82948571dcad67e0b1ed9436fa6eff0c9e3d0dd23dcf1e4' 
  AND token = 'NNjNh5XzyLX9xzpQYI5Jpx5poG5kucBPYB7EXcfFJwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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