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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76284bdfcb2ee058835d790c2e255e8334660ad0b9f83d6d68b0f288e8ed6697' 
  AND token = 'P5NEfCHf9WKmUv8/0nDgc5R1nDbbiju0/Pr7W+0RgdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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