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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19731f9b4fe078ae40ffb2669a915d18b07e9fe632df4a88dfb88509d4c404b' 
  AND token = 'Fea6FIdlPfhI80EQGDr8ti+qqEgl7/Q8z5GQiHS+DCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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