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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc28f0b1d54545c8cb0542c925c71b2d71351e8f6a7f9d693c8bbda7d05d2c3' 
  AND token = 'RCnT4v288K0ABNVDJ0mxcHTbnQmByhEHSeMSTy3pQ4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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