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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72db7eea0668d0f6b03a3b98ce4ea372596e6ef7c5f97fe27af30c7d7d1ce493' 
  AND token = '2lGKUhxPYiZvlMNBDcd9R2hpmdlKzD1pRaP2781Q3uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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