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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01a8d86883fcaab43a77a7d026cf6da528f7b50a5069711d128e312d4c5f578' 
  AND token = 'Ihwf2/kYeJ0eDNLKf5R79vSB0BEfU12YguxldQgS22w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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