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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a9534e08f82846523e4e4ff229cd976f46bb1b5be22189d6eaf3e44d70244c' 
  AND token = 'YZn65xrwd7mLQeRyV5eYiLrUJbALlxt6nI51a/NvQ1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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