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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2999ae9995df7796fede79b7a54c01fbfc6ed2a96f7d3ffec34aee12f2b5e8' 
  AND token = 'YNX2/bLY5Ci5deZ0NS//KdHlWcz10LLJKFKDA/ekjhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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