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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dd51da9b85b5ffad03cd842b28a6eafe88867f392520458273df6807c735520' 
  AND token = 'AJa2LCdtB/eufjyA8z54bm9hxC5AmajjIsLCjbO9HJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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