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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec0d0d0d33673a147c97031be4af0ec8618fa6d5dc6bafca4139f7c79e8d1a27' 
  AND token = 'rQgCY3fWATxUHCLH4OIR9EeaOeJ9EBRlUmSSjB8NYds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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