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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c671ecfb2ea9a2a94bf7e3abb3e36ea921c44cda2b44036a99d44a915faf33' 
  AND token = 'GuF2Vb10w2zXphycLv98Sn0x9ox1QWG48k52Zqi4/CM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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