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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8f6e476b108e9410bc4f14f0067df2fecb1d8e6f57dc23af76c117683a34a3b' 
  AND token = 'KbFm3TFnnWHI+9hn53RuXjaUdi1/NYbJAXb8XEhh4Fw=' 
  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"
    }
  }
}