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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c696e61a56a682e2b53d247286e1168343fef26851c88ec7431e1a0f76f2cbd' 
  AND token = '2uF9cTM31v38zInUdI52RCHBPqOBkSME4gf3UzJPJWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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