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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f90c42b0e321fc8cfc459dc7501e7958ec6f03252e88cd131f6c51e5ea9d61' 
  AND token = '6kk9IJ4CxckabTIwb0B42X1l2mUGysDUxrnfiJeFLMg=' 
  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"
    }
  }
}