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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc7f77262cb3d5866001d72fd8325b3bd3701ee042b049c6e028056ca2f0e110' 
  AND token = 'BgC9rrZz2FFNgk0loPPLQcpI7jBwJ221I/tBpVG5drY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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