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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3bc5ad2c0c423795fdc86f9739d8ca23a4d4977a6a4c454cc9a9bbd265909b3' 
  AND token = 'msLWlQLneSpmaiko5ZoJsDdGqc1roEngX3coJx2SPDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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