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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8672b5d0e74fe7bb129867f4ad5dbea53d5d096647bbf72b5c6e423b71bd21d4' 
  AND token = 'wwYuI0i8SabSepWxjPEL3siS4O7Wk8CeT3achKbJQ0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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