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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fe8f0ad5839e58c37b5e58002e7b415bfacf8107a8003032fdfe2ef0c04393c' 
  AND token = 'TRmEPfx7p0/tGGxusIQWF9HBc8mM8yMJqXbrY6gg9bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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