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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e79f43dde642624ccec0a81c3ab7a72f3bf540af4dea1b94824dce6122af0b61' 
  AND token = 'm3t/TR0crYQzqaxoKpzLhf+wDDhcETkvYlB5q8YGOpc=' 
  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"
    }
  }
}