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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cec0e86affad895c5d2039f6632a86b8e5d0323e3d87d38c819a1308dc327db' 
  AND token = 'wH9S4o7iRoMFqdg4kGL+lFv3RpGOZOY7HqB0FHMxGjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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