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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0fee2fc9c143b92c163abb01e09859b04262894ee6e1e54bf3b3a2c3e7d18e9' 
  AND token = 'GVsif9Wua3gYwhhLxo6NZzowws5Vr4gdWentmLjybMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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