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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f53aab2164b44ef0ee94cd85c31e6544ce0e1d4415c48c418a63b7153a8fead' 
  AND token = 'PCgzGfmV7PJq450nVHD4xUMIs+VxlU0y5VWtMsuPFIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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