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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a520bef9ef486bfc72034637d1d6a2f7ce09b6e3973f280956507ae6ca2c0ae' 
  AND token = 'HQeQ1xoe/q26WyPdLCAG3J1djHRd9x7NcBULZLHTvs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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