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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff26c7a24ee0038242370520f1e678e6bd864c63a9b49b5c2e4baa8339f553d' 
  AND token = 'ttAyVAJOVfbt1Y2Uuf7cA7lI00nV/P4Nfb/69R3S0b4=' 
  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"
    }
  }
}