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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c43647ab5e54d8bcaa12c716c653eb6d62483f19afbcd521a82736719c51237' 
  AND token = '4mygCG8AUBSExTjRYgRsbB0NmmxhtLcTeI5BdxNiDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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