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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1dccddf41b952893313b2d2ec56fbd8757132d15e714633d90e1f06f151b7b5' 
  AND token = 'I9oLGtp47+3FPe0jqeJClrdhOtkK5LTfksHgaPfF7ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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