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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c37af6e1c71960cf7eca3f2996dac8fabb0285c3c0db38878de62c6d54459fbe' 
  AND token = 'dcT+obRfRzLTmYg5jOERmeoCTrpcf7SO0xWw52goU/Y=' 
  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"
    }
  }
}